Metal clad refractory shapes



Dec. 26, 1967 J, L. cunas/muss, SR 3,359,698

METAL CLAD REFRACTORY SHAPES Dec. 26, 1967 J. 1 cuMMlNGs, SR 3,359,698

METAL CLAD REFRACTORY SHAPES Filed May 20, 1965 l 2 Sheets-Sheet 2 y@if* SLM gz BY em.. 0W

United States Patent O 3,359,698 METAL CLAD REFRACTORY SHAPES .lohn L.Cummings, Sr., Horizon House, 31 Island Way, Clearwater, Fla. 33515Filed May 20, 1965, Ser. No. 457,294 1 Claim. (Cl. 52-599) ABSTRACT FTHE DISCLOSURE This disclosure relates to a method of claddingrefractory bricks or other shapes with sheet metal known as metalcasings to prevent the brick from falling out during handling and tohold them in place in the walls in which they are used. It is among theobjects of this disclosure to provide a metal cased refractory articlewherein the casing is interlocked with the refractory material bydisplacing portions of the metal casing into preformed recesses formedby chamfered areas at opposite edges of the refractory bodies. Inaccordance with the present disclosure, the edges of the refractorymaterial are chamfered to provide a large area of contact for the sheetmetal material that is displaced therein as by means of a punch die in apress in which the cladding material is applied to the refractorybodies.

Various means of interlocking metal casing with refractory bodies havebeen heretofore proposed. One that has been extensively used consists ofdisplacing the metal in a dimple-like recess of the refractory brick orbody but this provides an insufficient area of contact and results inthe cladding material becoming loose and therefore relatively movable tothe refractory body.

A further object of the invention is to provide an interlock of thecasing which consists of two parts at the edge of the refractory bodyover an area where the juxtaposed edges of the cladding sheet materialcan be displaced into a recess common to both such edges.

The invention will become more apparent from a consideration of theaccompanying drawings constituting a part hereof in which like referencenumerals designate like parts and in which:

FIGURE 1 is a top plan View of a refractory brickshaped body with sheetmetal cladding applied and interlocked therewith in accordance with thepresent invention;

FIGURE 2 is an end view of a fragmentary portion of the metal casedrefractory article of FIGURE 1 showing the detail of the edge interlockof the casing with a chamfered portion of the refractory body;

FIGURE 3 is a vertical section, partially in elevation, taken along theline 3 3 of FIGURE 1;

FIGURE 4 is a view in perspective of a metal cased refractory body witha hanger strap attached thereto;

FIGURE 5 is a top plan view of the refractory body before cladding;

FIGURE 6 is an end elevational view thereof;

FIGURE 7 a vertical section taken along the line 7-7 of FIGURE 6;

-FIGURE 8 an end view of a U or channel-shaped cladding member of whichthere are two employed in encasing the brick of FIGURE 1; and,

FIGURE 9 is a side elevational view of the casing shown in FIGURE 8.

With reference to FIGURE 5 of the drawing, the numeral 1 designates arefractory body of what is termed in the industry as a basic refractorycapable of withstanding high temperatures for use in open hearth fur-3,359,698 Patented Dec. 26, 1967 naces and the like, the granularmaterial With a suitable binder being molded in presses and eithercornpacted by vibration or a high pressure to the shape of a brick as isshown in FIGURES 5 through 7. A feature of the invention is molding thebrick With chamfered areas designated by the numeral 2 which, as shownin FIGURES 6 and 7, occurs on opposite faces of the brick. FIGURES 8 and9 show channel-shaped casings 3, which are punched out in a manner topre-stress the sheet material so that the legs 4 of the channels arebiased inwardly, they being shown as spread in FIGURE 8 of the drawingfor the purpose of inserting the refractory brick, which is shown in dotand dash lines.

As shown in FIGURE 1, the channel members 3 are provided with legs 4that are slightly short of half of the width of the brick so as to leavea clearance of space 5, FIGURE 1, so that they cannot abut whenassembled, as in FIGURE 1. If the edges designated by the numeral 6 inthe drawing did abut, the cladding could not be tightly engaged With therefractory body, as is apparent. When the channel members 3 areassembled, as shown in FIGURE 1, a forming die shaped to conform to thechamfer 2 of the refractory body, displaces the metal in the form ofears 7, FIGURE 2, to conform to and intimately engage t-he chamferedportions at the edges of the brick. It will be noted that the chamfers 2and ears 7 provide contact over a relatively wide area to securelyinterlock the metal casing with the refractory bodies against `anydisplacement. By this construction, the refractory brick 1 can beprovided with the chamfered areas 2 in a simple molding operation atopposite edges and the cladding metal can be made to conform to thechamfer because the full pressure on t-he ear forming dies is -availableagainst the resistance of the refractory body 1, thus assuring that themetal casing is tightly and securely engaged with the refractory body 1.

In the construction shown in FIGURE 4, the brick is assembled in thecasing material in the same manner as in FIGURE 1, but is provided witha hanger strap 8 having a slot 9 by which it can be mounted to roof or`arch suspension supports in a well known manner.

I claim:

A metal clad refractory shape comprising a substantially brick shapedbody of a basic refractory material molded to a shape having end facesand side faces and having a chamfered area at opposite edges atsubstantially the center of the small ends of the brick with the beveledfaces of the chamfered area extending at an angle from the end faces ofthe brick upward toward and to the longitudinal center of the side facesof the brick, U-shaped metal casings enveloping the side faces of saidshape having the legs of the casings juxtaposed with lspace between theedges and having portions of the edges of the legs overlying thechamfered areas, said overlying portions being depressed into intimatecontact with the entire surface of the chamfered area of said bodyunderlying said portions to interlock said casing and body.

References Cited UNITED STATES PATENTS Re. 25,615 7/1964 Reynolds et al.52599 X 3,208,412 9/1965 Crookston et al. 52-484 X 3,280,772 10/1966Burklo 52-599 X FOREIGN PATENTS 574,225 4/ 1959 Canada.

FRANK L. ABBOTT, Primary Examiner.

A. C. PERHAM, Assistant Examiner.

